We're in Central PA. It's cold.
Things to do for new/on bedrest moms:
1. Remember older kids. If this is your friend's first pregnancy, obviously not applicable but if it isn't she's going to have a kid who wants/needs special attention and isn't going to be getting any, probably for several months. Someone who would be willing to volunteer 2 hours at a time to do things with the older child (read a book, go to the park, etc) would be helpful.
2. Laundry. She'll have tons, and it's fairly easy for people to help out.
3. Food. Grocery shopping, cooking & freezing meals in advance, etc. It's helpful to everyone, but would be an absolute necessity with triplets. Don't forget snacks for hungry breastfeeding mammas & older kids.
4. Breastfeeding support. Someone fairly knowledgable about preemies/smaller babies (like a lactation consultant) would be ideal. Of course, not everyone is going to be an experienced breastfeeder, so anyone who comes in to help needs to know what they can do to support nursing (i.e. preparing stored breastmilk for babies, proper cleaning & storage of breastpump & bottles, etc). Part of this is ensuring that diapers & bottles fed to babies are all documented. With one baby and one person doing most of the feeding, it's easy to see who got what and whether it was enough. Toss in two more babies and several more adults and you've got a recipe for mess.
5. Time. In particular, schedule time with other people in the house so that mamma can take a shower/bath by herself. Why? I don't think I need to explain that to any of you ladies... if I do, have another baby and find out.
6. Organization. Your friend will want a big old whiteboard (and/or a notebook... but in my experience, those get lost) with the babies color-coded on it so that everyone can immediately say what they've done for whom. For example, Baby A had 3 oz of pumped breastmilk, 1.5 oz of NeoSure, and a poopy diaper at 2 p.m. If lots of people are helping, the need for such documentation (and a central, GLARINGLY OBVIOUS place to put it) becomes greater.
I've seen lists online, though. A great many of them.
They're usually on websites for helping with multiples.